A New Sibling Species of Ambystoma from the Ohio River Drainage

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Abstract
A new sibling species of Ambystoma texanum [A. barbouri, sp. nov.] is described from central Kentucky and adjacent Ohio and Indiana. It differs from A. texanum in several morphological, ecological, behavioral, and reproductive characteristics. The new form is largely parapatric to A. texanum, though both species are sympatric in western Kentucky and possibly in southwestern Ohio. Two areas where the two species are sympatric or parapatric are described in detail and evidence for some introgression is presented. Possible reproductive isolating barriers between the two species are discussed.